163 lines
3.6 KiB
C
163 lines
3.6 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
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* Copyright 2006 Ricardo Correia. All rights reserved.
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* Use is subject to license terms.
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*/
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/* Copyright (c) 1988 AT&T */
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/* All Rights Reserved */
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#include <stdio.h>
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#include <string.h>
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#include <mntent.h>
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#include <sys/errno.h>
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#include <sys/mnttab.h>
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#include <sys/types.h>
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#include <sys/sysmacros.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#define BUFSIZE (MNT_LINE_MAX + 2)
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static __thread char buf[BUFSIZE];
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#define DIFF(xx) ( \
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(mrefp->xx != NULL) && \
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(mgetp->xx == NULL || strcmp(mrefp->xx, mgetp->xx) != 0))
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int
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getmntany(FILE *fp, struct mnttab *mgetp, struct mnttab *mrefp)
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{
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int ret;
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while (
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((ret = _sol_getmntent(fp, mgetp)) == 0) && (
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DIFF(mnt_special) || DIFF(mnt_mountp) ||
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DIFF(mnt_fstype) || DIFF(mnt_mntopts))) { }
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return (ret);
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}
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int
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_sol_getmntent(FILE *fp, struct mnttab *mgetp)
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{
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struct mntent mntbuf;
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struct mntent *ret;
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ret = getmntent_r(fp, &mntbuf, buf, BUFSIZE);
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if (ret != NULL) {
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mgetp->mnt_special = mntbuf.mnt_fsname;
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mgetp->mnt_mountp = mntbuf.mnt_dir;
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mgetp->mnt_fstype = mntbuf.mnt_type;
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mgetp->mnt_mntopts = mntbuf.mnt_opts;
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return (0);
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}
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if (feof(fp))
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return (-1);
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return (MNT_TOOLONG);
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}
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static int
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getextmntent_impl(FILE *fp, struct extmnttab *mp)
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{
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int ret;
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struct stat64 st;
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ret = _sol_getmntent(fp, (struct mnttab *)mp);
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if (ret == 0) {
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if (stat64(mp->mnt_mountp, &st) != 0) {
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mp->mnt_major = 0;
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mp->mnt_minor = 0;
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return (ret);
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}
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mp->mnt_major = major(st.st_dev);
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mp->mnt_minor = minor(st.st_dev);
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}
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return (ret);
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}
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int
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getextmntent(const char *path, struct extmnttab *entry, struct stat64 *statbuf)
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{
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struct stat64 st;
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FILE *fp;
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int match;
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if (strlen(path) >= MAXPATHLEN) {
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(void) fprintf(stderr, "invalid object; pathname too long\n");
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return (-1);
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}
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/*
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* Search for the path in /proc/self/mounts. Rather than looking for the
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* specific path, which can be fooled by non-standard paths (i.e. ".."
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* or "//"), we stat() the path and search for the corresponding
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* (major,minor) device pair.
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*/
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if (stat64(path, statbuf) != 0) {
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(void) fprintf(stderr, "cannot open '%s': %s\n",
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path, strerror(errno));
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return (-1);
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}
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if ((fp = fopen(MNTTAB, "re")) == NULL) {
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(void) fprintf(stderr, "cannot open %s\n", MNTTAB);
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return (-1);
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}
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/*
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* Search for the given (major,minor) pair in the mount table.
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*/
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match = 0;
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while (getextmntent_impl(fp, entry) == 0) {
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if (makedev(entry->mnt_major, entry->mnt_minor) ==
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statbuf->st_dev) {
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match = 1;
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break;
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}
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}
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(void) fclose(fp);
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if (!match) {
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(void) fprintf(stderr, "cannot find mountpoint for '%s'\n",
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path);
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return (-1);
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}
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if (stat64(entry->mnt_mountp, &st) != 0) {
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entry->mnt_major = 0;
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entry->mnt_minor = 0;
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return (-1);
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}
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return (0);
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}
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